| From: | Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: JIT compiling with LLVM v11 |
| Date: | 2018-03-11 17:21:25 |
| Message-ID: | 6e253566-1757-9c86-bfe1-d47a4c493c71@2ndquadrant.com |
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| Lists: | pgsql-hackers |
On 3/9/18 15:42, Peter Eisentraut wrote:
> The default of jit_above_cost = 500000 seems pretty good. I constructed
> a query that cost about 450000 where the run time with and without JIT
> were about even. This is obviously very limited testing, but it's a
> good start.
Actually, the default in your latest code is 100000, which per my
analysis would be too low. Did you arrive at that setting based on testing?
--
Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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